Method of improving the adhesion of rubber to cotton



Patented Novi a, ate g I I 2,300,592

uNil'El) STATES PATENT OFFICE METRO!) I MIPBOVING THE ADHESION OF RUBBER TO ('J0'.I.".I.(')N

Edward G. Partridge, Stow, Ohio, assignor to The B. E; Goodrich Company, New York, N. Y., a corporation of New York No Drawing. Application September 14, 1939,

Serial N0. 294,933

3 claims. (01. 54-2) This invention relates to the adhesion of rubsquare woven cotton fabric was dipped in the her to cotton in the form of cords, fabrics, and following dispersion of a pectin-containing vulthe like. canizable rubber composition:

The length of service of many articles of commerce embodying cotton and rubber such astires 5 f fz ifgf I solids) :3 2'; and belts, for instance, is largely dependent upon zinc Oleate the degree of adhesion between the rubber and a the cotton. It is the principal object of this ingggjgfiggggfiifig "*"ggg'g vention, accordingly, to provide a method where- Sulfur "T -"7 by the adhesion between rubber and cotton may 10 AldoLalpfiamafihmylamme do be increased. Pectin "f Rubber ordinarily adheres rather poorly to ag cotton, the adhesion being due mainly to mewater 1 liters 1 chanical interlocking of the cotton fibers and the rubber rather than to any true adhesive bond 15 The treated fabric was dried without vulcanizing between the cotto an th mbb By t the rubber and coated with a tire carcass stock. method of this invention, cotton is subjected .vtd o p es we e sup pos d and vu nized und r a treatment which permits adhesive bonding bepressure in a heated mold to ther wi h similar tween rubber and cotton. structures made with fabric treated with the I have discovered that the adhesion of cotton above dispersion containing no pectin. when it to rubber is increased byapplying to the cotton was attempted to sep ra e the P it w un a dispersion of a vulcaniliable rubber com osi t a 0% mp e e inodhes on was obtion containing pectin, associating the treated ed y incorporating P in in he dispersion. cotton with vulcanizable rubber, and vulcanizing Although I a herein disclosed a sp ifi the assemblage by heating under pressure. xample of the method of my inven n. I do The vulcanizable rubb dispersion may b any not intend that the invention be' limited solely of the conventional natural or artificial disperthereto, for it Will v olls o hose skilled in sions of r bb r o t i i Vulcanizing agents the art that many variations and modifications and accelerators, which compositions are well are W n the spirit a scope of the invention known to the art. The pectin may be included defined in the p d d c imsin the dispersion in any desired small proportion, I claim: 10 parts pectin to 100 parts of rubber being ordi- 1. The method of improvin he adhesion of nariLv satisfactory although it will be understood rubber to otton cord which comp applyin that greater or l proportions may b employed to the cord a dispersion of a vulcanizable rubber depending on the particular rubber compositions composition containing pectin, drying the treatinvolved and the degree of adhesion desired. It d 00rd. bringing h tr d Contact With is usually desirable though not essential. to in- Zvulcanizable rubber while the coating is Still clude a wetting agent in the dispersion to assist n vnlcanized, and vulce c the ass m a byin the penetration of the cotton by the dispersion. heating under pressure. The synthetic saponaceous penetrants such as 40 The vmethod of p ovin he adhesion o the alkali metal salts of sulfated fatty acid esrubber to cotton which mpr s ppl in to the ters, of sulfated fatty acid amides, of sulfated cottons er ion of a vulcanizable rubber coma fatty alcohols, and of monoand di-alkyl subposition i ing pectin, dryin thetreated cotstituted aromatic sulfonates, and which are sold n. bringing the treated cotton in oonteot with under trade names uch as New Te 1w! Aqua 8. S011! vulcanizable rubber composition while the rex, and Dispersaid, are particularly useful wetcoating is still unvulcanized, d Vulcanizing ting agents in the practice of this invention. the assemblage b heating under Pressure.

The dispersion may be applied to the cotton 3. An article r m n fac ure c mprisin vulfibers by any desired means, although dipping 4 canized rubber free from pectin, and cotton, and the cotton in the dispersion is the method now & ayer of vulcanized ,rubber containincpeotin preferred. The treated cotton is then dried p i ed from 11 queous dispersion of rubber without vulcanizing the coating-and incorporated and pectin uniting the cotton to the rubber free into rubber articles prior to vulcanization in the from manners well known to the art. i

A; a. specific embodiment of this invention,

anwaan a. Hammer. 

